adding/subtracting
56+12
68
7X4
28
45X3
135
(9X7)-18
45
8 / 4
2
78-23
55
8X9
72
6X41
246
98-3X6
80
49 / 7
7
123+243
11X12
9X85
765
4+20+6x2
36
765 / 5
153
639-202
437
6X7
42
67X67
4489
(7x0)+19-3
16
691 / 8
86 R3
64758-273
64,485
70X5
350
34X27
918
79-12+4x2
75
901 / 17
53